Walnut Twig Beetle Pityophthorus juglandis Blackman, 1928Non-native  Synonyms: Black Walnut Twig Beetle.


Native range is the American Southwest, but known to attack Black Walnut and of serious concern if established in the eastern U.S. Has been recorded in Cecil Co., Maryland.


"Thousand cankers disease (TCD) is a disease complex native to the western United States and primarily affects Black Walnut (Juglans nigra). This disease is the result of the combined activity of a fungus (Geosmithia morbida) and the Walnut Twig Beetle (Pityophthorus juglandis)." (Thousand Cankers Disease web site).

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